Alarm-signal for boilers.



PATENTED JAN. 15, 1907.

H. SANDVOSSL ALARM SIGNAL FOR BOILERS.

APPLICATION FILED FEB. 23, 1906.

2 SHEETS-SHEET 1.

: 3K be PATENTED JAN. 15, 1907. H. SANDVOSS.

ALARM SIGNAL FOR BOILERS.

APPLIOATION FILED FEB. 23, 1906.

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UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Jan. 15, 1907.

Application fil d February 28, 1906. Serial Ru. 302,485.

To all whom it may concern:

Be it known that I, HERMANN Sannvoss,

a subject of the German Emperor, residing at Neuss-on-the-Rhine, in the Kingdom of Prussia, German Empire, have invented a new and useful Alarm-Signal forBoilers, of which the following is a full andcomplete specification.

This invention relates to an alarm-Si al for boilers, &c., which signals a too hig or too low steam-pressure and also a too low or too high water-stand.

The invention is shown on the accompanying drawings.

Figure 1 is a front view of a boiler furnished with the new apparatus. Fig. 2 is the apparatus in section, while Fig. 3 represents a s ecial form of the apparatus for showing t stand of the water.

The apparatus may, as shown, be con nected with the water-gage of the boiler direct, and the alarm-signal may be fixed so as to indicate the height of the water in theiage itself or in a separate tube or reed 4. 25

the latter there is a reed 5, which is filled with mercury to such a height that it about equals the normal height of the water in the boiler. In the'reed 5 there is a conductor 7, which is held by the insulating-sleeves 8, which are fixed in the reed 5. It is advisable that there be a vacuum above the mercury column 6. The reed 5 is connected at the top with a threaded brass sleeve 30 or simi-' lar means, on which the regulating-screw 9 and the counter-nut 10 are screwed. The

conductor 7, which is of wire or other suitable means, is carried through the regulatingscrew 9 and held in it by an insulator 8. The wire 7, with the nut 11, rests against the insulating-ring 12 on the regulating-screw 9. B moving the regulating-screw 9 the wire, which is adjustable in the insulators, may be moved in either direction and so set exactly to the water-stand required. The conductor 7 is connected by the wire 14 between the nuts 11 and 12 with an electric su pl 15 and a signal 16, while the reed 5, w ie is also made of some conducting material, is also connected with the alarm-signal 16 and the supply 15 by the wire 17. Water-tube 4 is connectedatits lower end-b pipe 1 with the water-space of boiler 2. it is also connected at its u per end and above the maximum height 0? mercury column 6 with the steamrspace of the boiler by pipe 100.

'rugated metal and is elastic.

At the normal height of the water in the boiler the mercury s own in the drawin If, however, the water falls, the quicksilirer. 6, influenced and expanded by the steam, will come into contact with the conductor 7, by which a circuit the drawings the current passes from the battery 15 through the conductor 7 and through the mercu column to the reed 5 conductor 14 to thea arm 16, and back to the battery.

The apparatus may also be made to signal too high a stand of the water. For this purpose a second mercu'liy column 36 is fitted at the top of the tube, ig. 3, on which rests a bush 37 or any similar object. If then the top column of mercury be influenced by the water rising too high in the boiler, itcools andcontracts accordingly, so that the bush sinks and with it the contact-plate 39, which rests lightly on it and is connected with the conductor 38. .-The contactlate touches the edge of the sleeve 41, whic is separated from it by the insulators 40, whereby a circuit is set up, the current going from the battery 42 througli the conductor 45 to the sleeve 41, irom here through the contact plate 39 and the conductor 38 t9. the alarm 43, and from the latter to the battery 42. When this mhthod is applied, the ower column of mercury is connected'by the conductor 44 with the battery 42.

In the housing 19 with its cover 18, which is connected by the pipe 20 with the upper horizontal tubes of the water-gage or with the steam-chamber of the boiler, there is a diaphragm 21, which is suitably made of cor- On this diaphragm, which may alsobe infiuenc d by a spring, rests the pin 22, which is rried through the cover 18. The pin 22 may also be secured to the diaphragm 21, which may also be replaced by a piston.

On the cover 18 are the insulated plates 23 and 24, to which are attached the conduct ing-wires 25 and 26; On a further plate 31 there is a single or, as shown in the drawings a double lever 27 pivoted, which is influence by a weight or a spring 28. From the plate 31 there leads a wire 32 to the alarm 16 while the wires of the plates 23 and 24 lead to the battery 15.

The diaphragm21 is sprung toward one side, while it is influenced on the other by the pressure in the pipe, whereby when the nor- 1s set up. With the construction shown in stands at the position lever upward, whereby to of the lever 27 into contact with the platn'24,

I the stand of the water mal ressure is attained itis exactly centhe stand of the water and the'pressure may tered If new the pressure becomes too also be separate.

eat, the diaphragm moves upward, which Having now fully described myinvention, y meansof thepin'in turn moves 'thei double what I claim as new, and desire to secure by the contact-pin sinks Letters Patent, is onto the contact-plate 23 and closes the cir- 1, In a boiler-alarm, an outer tube, an inner tube, a mercury column within the inner cuit. On the other hand, when the pressure is too low the diaphragm 1n striving to reach 1 toube, a contact adapted to be engaged thereitsnormal position, brings the contact-pin 34 an alarm 1n c1rcuit,'m'cansfor connecting the lower end of the outer tube with the water-space of the boiler, and meansfor connecting t no upper end of said tube with the steamspace of said bo1ler,substantiallyas specified. 2. In a boiler-alarm, an outer tube, an infor, as shown in-the drawings, with a pin or red 35. Ijlpw in order to stop the alarm when, for example, the fires are put 'out and to bring it"automatically into work again, l thecontact-pin 34 ismade resilient. When l ner tube, a lower mercur column, and a it touches the contact-gin 35, the current is so arate upper mercury c0 umn in the inner closed. If, however, t e pressure becomes tn )e, contacts for said columns, an alarm in less, the resilient} pm 34 leaves the p1n35, I circult, meansfor eennlecting the'lowcr erldof an t us rea st recurrent. I t e outer tube witi t 1c water-space o the In order to facilitate the setting of the conboiler, and means for connecting the upper tact-lgver 2%, a scale or similar contrivance endl of said tube with the steam-space of said may eemp eye I l )()1 er su stant1a yas speci ied.

In place of a slnglc 51.18.1151 I}? ffir lrzdlczlttllng Slgiierll byf me} at Dusseldorf, Germany,

an t 'e ig 1 am ow a t 115 2 ayo Fe )ruary, 1906. of the steam there maybe different 1 Y so that it is quite audible whether i HERLIANN SANDVOSS' low or whether the pressure of 2 pressure alarms, the water is too steam is too high or too low. The contrivance for showing or indicating i Witnesses:

WILLIAM EssENwEIN, la rnn LIEBER. 

